Find any 231- phone number in Michigan

The 231 area code is part of the North American Numbering Plan (NANP) and is associated with the state of Michigan. It encompasses the northwest corner of the Lower Peninsula and covers about 6,800 square miles. Included in the 231 area code are the major cities of Traverse City, Muskegon, and Big Rapids, as well as the Manistee National Forest.

The North American Numbering Plan (NANP) is a system that includes country-level services for national and international telecommunications. Within the national system, area codes designate particular geographic regions, allowing for long-distance calls to specific local numbers. Area codes are also responsible for direct inward dialing, used to distinguish between local and long distance calls. In the US, Canada, and certain Caribbean countries, ten-digit dialing (three-digit area codes followed by seven-digit telephone numbers) is used in all calls. As technology advances, so does the NANP, adding numbers or changing area codes as needed.